The investigation, which began in June, also recovered several thousand dollars in cash and two handguns at the home in the 100 block of Emrose Drive, according to Mike Manko, spokesman for the Allegheny County District Attorney's Office.

While Trey Alexander Clark was being taken away in handcuffs, the 22-year-old suspect said, "It's a misunderstanding." He then added, "I'm guilty. You know what I'm saying? But not for everything. You know what I'm saying?"

As he was being arrested, Clark was asked, "So you're admitting to having all of that heroin?" He replied, "I mean, would it even help me to not admit it? I mean, it is what it is. I came clean."

Clark faces drug-related charges of possession and possession with intent to deliver, according to the online criminal docket.

The district attorney's Narcotics Enforcement Team, state police and police departments from McKees Rocks, North Versailles and Swissvale were part of the investigation.

Photos: Heroin, marijuana growing operation found at Penn Hills home

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A months-long investigation led police to seize nearly 10,000 bags of heroin and uncover a marijuana growing operation Thursday in Penn Hills.

WHAT POLICE BELIEVE LED UP TO THIS MURDER. BOB HAZEN, CHANNEL 4 ACTION NEWS. POLICE MAKE A DRUG BUST AND WE'RE THERE AS THE SUSPECT IS LED AWAY IN HANDCUFFS. LISTEN TO WHAT HE SAID. I UNDERSTAND. UNDER WHAT? I'M GUILTY, YOU KNOW WHAT I'M SAYING? BUT AFTER EVERYTHING THAT I'M -- YOU YOU IT KNOW WHAT I'M SAYING? THAT IS TREY CLARK. HE WAS ARRESTED AFTER THEY FOUND A LARGE QUANTITY OF HEROIN AND MARIJUANA AND GROWING OPERATION INSIDE OF HIS HOME IN PENN HILLS. THE 22-YEAR-OLD PICKED UP THURSDAY AND HE CERTAINLY DID HAVE A LOT TO TALK ABOUT. YOU'RE ADMITTING TO HAVING ALL OF THAT HEROIN? I MEAN, WOULD IT EVEN HELP ME IF I WAS NOT TO ADMIT IT? I MEAN, IT IS WHAT IT IS. IN ADDITION TO THE PLANTS AND